| 饱和黏土不排水剪切特性及双曲线模型 |
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| 引用本文： | 齐剑峰,栾茂田,王忠涛,聂影,范庆来.饱和黏土不排水剪切特性及双曲线模型[J].岩土力学,2008,29(8):2277-2282. |
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| 作者姓名： | 齐剑峰 栾茂田 王忠涛 聂影 范庆来 |
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| 作者单位： | 大连理工大学 海岸和近海工程国家重点实验室/土木水利学院岩土工程研究所，大连 116024 |
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| 基金项目： | 国家自然科学基金资助项目
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国家自然科学基金重点基金资助项目
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教育部科学技术研究项目重大项目 |
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| 摘 要： | 采用真空抽吸制样技术制备的饱和重塑黏土，在0.015?3.75 %/min应变速率范围内进行了多组不固结不排水（UU）剪切试验。通过对试验结果的分析，着重探讨了应变速率和约束压力对应力-应变关系及其强度特性的影响。试验结果表明，黏土的应力-应变关系与强度特性基本上不依赖于约束压力，而受应变速率的影响较为显著，强度随应变速率的增加而增长，增长幅度可达70 %，通过对数据的归一化，采用线性拟和建立了不排水强度与应变速率之间的经验关系。进而考虑应变速率对不固结不排水应力-应变关系的影响，对双曲线非线性本构模型进行了研究，详细介绍了模型参数的确定方法，并分别采用静力三轴和扭剪试验结果对模型进行了验证。
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| 关 键 词： | 饱和黏土 应变速率 应力-应变关系 双曲线模型 |
| 收稿时间： | 2006-03-03 |
Study on undrained shear behavior and hyperbolic stress-strain relationship of saturated clays |
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| QI Jian-feng,LUAN Mao-tian,WANG Zhong-tao,NIE Ying,FAN Qing-lai.Study on undrained shear behavior and hyperbolic stress-strain relationship of saturated clays[J].Rock and Soil Mechanics,2008,29(8):2277-2282. |
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| Authors: | QI Jian-feng LUAN Mao-tian WANG Zhong-tao NIE Ying FAN Qing-lai |
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| Institution: | State Key Laboratory of Coastal and Offshore Engineering, Institute of Geotechnicial Engineering, School of Civil and Hydraulic Engineering, Dalian University of Technology, Dalian 116024, China |
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| Abstract: | A series of unconsolidated-undrained (UU) triaxial tests are performed in order to examine the effect of strain rate and confining pressure on strength and stress-strain behavior of reconstituted saturated clays. Strain rate is controlled to vary between 0.015 %/min and 3.75 %/min. It is found by comparing the experimental data that strength and stress-strain behavior are mainly affected by strain rate, however, they are almost independent on confining pressure. Undrained shear strength of the saturated clay increases with increase of strain rate; and the increase of 70 % of strength may be attained. An empirical correlation between strength and strain rate is proposed after a given normalization. Furthermore, the hyperbolic constitutive model of nonlinearity is recommended in order to take the effect of strain rate on the stress-strain relation into consideration; and the experimentally-based procedure for defining the parameters in the hyperbolic model is given. The model is verified through test data in the monotonic triaxial and torsional shear tests. |
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| Keywords: | saturated clays strain rate stress-strain relations hyperbolic stress-strain model |
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